| be of rare occurrence | 很少发生 |
| be of service to | 对...有用 |
| be of some help to sb | 对某人有些帮助 |
| be of some help to sb. | 对某人有些帮助 |
| be of the same mind | 意见相同 |
| be off of one's head | 发疯, 神经错乱, 神志不清 |
| be off one's game | 竞技状态不佳 |
| be off one's head | 神经错乱 |
| be off the habit | 已戒去毒瘾 |
| be off the press | 已印好, 已发行 |
| be offended at | 对...感到很生气 |
| be offended with sb for sth | 对(某人)因(某事)而生气 |
| be offered a place as... | 被聘请担任... |
| be offhand with sb | 对某人简慢无礼 |
| be officially termed | 被正式称作... |
| be old enough to know better | 岁数不小应更懂事些了 |
| be old for one's years | 比年龄显得老 |
| be on a diet | 进规定的饮食, 节食 |
| be on a false scent | 追踪的线索不对 |
| be on a good wicket | 处于有利地位 |
| be on a lark | 在闹着玩儿 |
| be on a losing streak | 在一段时间中连续失败 |
| be on a parity with | 和...平等 |
| be on a razor's edge | 在危急关头, 在锋口上 |
| be on a sticky wicket | 处于不利地位 |
| be on a winning streak | 在一段时间中连续成功 |
| be on an equality with | 与...平等 |
| be on an equality with... | 与...平等 |
| be on bad terms with sb | 同某人关系不好 |
| be on familiar terms with... | 与...亲密, 与...交情很好 |
| be on first-name terms with sb | 同某人称名不称姓, 同某人很熟 |
| be on good terms with sb | 同某人关系好 |
| be on heat | 发情, 性欲冲动 |
| be on intimate terms with | 【法】 与...关系密切, 有不正当性关系, 熟悉... |
| be on it | 准备就绪, 决定动手做某事 |
| be on leave | 在休假 |
| be on location | 在拍外景, 在外景地 |
| be on one's back | 仰卧, 生病卧床 |
| be on one's best behaviour | 举动规矩, 行为检点 |
| be on one's ear | 在发怒 |
| be on one's game | 竞技状态佳 |
| be on one's good behavior | 举动规矩, 行为检点 |
| be on one's high horse | 趾高气扬 |
| be on one's honour to do sth | 道义上有责任做某事 |
| be on one's honour to do sth. | 道义上有责任做 |
| be on one's mettle | 鼓起勇气 |
| be on one's uppers | 穿着破旧的鞋子, 一贫如洗, 处于困境 |
| be on parole | 宣誓后被释放, 被假释 |
| be on sb's back | 嘲笑/指责(某人), 打扰/惹恼(某人) |
| be on sb's track | 追踪着某人, 掌握着某人行为的线索, 掌握着某人企图的线索 |
| be on sb.'s back | 嘲笑某人, 打搅某人 |
| be on sentry | 站岗, 执行步哨勤务 |
| be on short commons | 吃不饱 |
| be on speaking terms | 关系好, 只是泛泛之交, 相适应 |
| be on tenterhooks | 提心吊胆, 焦虑不安, 如坐针毡 |
| be on the advance | 在上涨中 |
| be on the ball | 在精力充沛地行动, 知情, 内行 |
| be on the bench | 当法官, 当主教, 坐冷板凳 【法】 当法官 |
| be on the cushion | 景况优裕 |
| be on the door | 守门, 门口值勤 |
| be on the downgrade | 每况愈下, 降低等级, 降低级别, 降低工资, 贬低, 不重视 |
| be on the drink | 酗酒 |
| be on the hedge | 骑墙, 耍两面派 |
| be on the loose | 无拘束, 散漫, 逍遥法外, 放荡, 寻欢作乐 |
| be on the market | 被供应出售 |
| be on the mike | 偷懒, 呆儿郎当 |
| be on the muscle | 准备动武, 准备蛮干 |
| be on the rack | 受酷刑, 受折磨, 极度不安 |
| be on the ragged edge | 几乎失去自制, 濒于精神失常 |
| be on the rates | 领取公共救济金 |
| be on the razzle | 狂欢 |
| be on the receiving end | 接受别人的礼物, 成为攻击目标 |
| be on the right tack | 方针正确 |
| be on the rope | 用绳系在一起 |
| be on the scent | 追踪着, 探究着 |
| be on the sick list | 害着病 |
| be on the spree | 在狂欢中 |
| be on the stick | 警觉 |
| be on the straight | 品行端正 |
| be on the strength | 编在士兵册上 |
| be on the tiles | 寻欢作乐 |
| be on the tiptoe of expectation | 翘首以待, 殷切期望 |
| be on the track of sb | 追踪着某人, 掌握着某人行为的线索, 掌握着某人企图的线索 |
| be on the track of sb. | 追踪着某人, 掌握着某人的线索 |
| be on the upswing | 正在高涨 |
| be on the warpath | 准备作战, 开始作战, 正在作战, 准备争吵, 正在争吵 |
| be on the watch | (对...)留神着, (对...)戒备着 |
| be on the wrong tack | 方针错误 |
| be on thorns | 如坐针毡 |
| be on ticket-of-leave | 获准假释在外 |
| be on to | 意识到, 找...岔子 |
| be on vacation | 在度假期 |
| be on visiting terms with | 和...有交往 |
| be on wires | 紧张, 极度兴奋 |
| be one's own enemy | 害自己 |
| be one's own man | 不受他人控制 |
| be one's own master | 独立 |
| be one-up on sb | 胜某人一筹, 胜...一筹, 占...的上风 |
| be oneself | 处于正常状态, 显得自然, 显得真诚, 身心健康 |
| be only skin and bone | 瘦得皮包骨 |