off (one's) guard
1. 不提防
Seeing the opponent was off guard, the boxer landed a knockout punch.
乘对手不提防, 那拳击手一下子把他击倒了。
on (one's) guard
1. 提防
Be on guard against those who are jealous of your success.
要提防那些嫉妒你的成功的人。
习惯用语be off one's guard1.疏忽, 大意, 不提防2.不值班catch sb. off guard1.乘某人不备; 使人措手不及catch sb. off his guard1.乘某人不备; 使人措手不及come off guard1.【军】离防; 下防lower one's guard1.丧失警惕drop one's guard1.丧失警惕get past sb.'s guard1.冲破某人的防御(指拳击; 击剑等)keep guard1.站岗, 放哨stand guard1.站岗, 放哨mount guard1.站岗, 放哨keep sb. under close guard1.把某人置于严密监视下off guard1.不当班; 不备, 疏忽old guard1.某一事业(或主张)的老一辈的维护者2.守旧派, 保守分子on guard1.值[当]班, 警戒, 准备防御on one's guard1.警戒[提防]着put sb. off his guard1.使某人不提防throw sb. off his guard1.使某人不提防set sb. on guard1.使某人提防put sb. on guard1.使某人提防put sb. on his guard1.使某人提防set sb. on his guard1.使某人提防relieve guard1.接[换]岗change guard1.接[换]岗row the guard1.用小船在军舰周围巡逻run the guard1.偷过哨兵线stand guard over1.看守stand on one's guard1.警戒, 提防stand upon one's guard1.警戒, 提防be on one's guard1.警戒, 提防be upon one's guard1.警戒, 提防lie on one's guard1.警戒, 提防lie upon one's guard1.警戒, 提防turn out the guard1.集合警卫人员2.[口令]警卫队持枪列队guard against1.提防, 预防特殊用法adjustable guard1.可调防护挡板air-antitank guard1.空中防坦克监视哨anti splash guard1.挡泥板, 挡溅板; 切削液挡板antispray guard (plate)1.防油喷溅护板aqueous weir guard1.水相堰板ashpan axle guard1.灰盘车轴护挡axle box guard1.轴箱导板back side guard1.轧机出口侧的推床导板balance guard1.摆轮护板balanced guard1.平衡卫板, 平衡防护装置, 吊挂卫板bell guard1.护手盘brush lipless guard1.(割草机切割器的)平顶短护刃器burner guard1.护焰罩canopy guard1.护顶channel-section-bar guard1.(带锯的)安全导槽chip guard1.切屑防护器, 防屑罩coast guard1.缉私人员; 海岸警卫队connecting wires guard1.引线护板corona guard1.电晕?ど璞?cutter guard1.切割器护刃器derailment guard1.出轨防止器dirt guardkey1.防尘罩, 挡泥板dust guard1.防尘罩, 挡泥板elbow guard1.护肘eye guard1.护目罩, 眼罩face guard1.防护面具flash guard1.防弧装置, 闪络防止器grain (saving) guard1.禾谷扶倒器, 扶茎器, 扶穗器, 果穗导板grit guard1.抛?ぐ?heat guard1.绝热体heavy-duty guard1.加强护刃器, 重型护刃器ice guard1.破冰器; 破冰船; 冰挡implosion guard1.(电视接收机)防爆玻璃journal packing guard1.轴箱油垫挡knee guard1.护膝life guard1.救生员2.(机车)排障器lifting guard1.扶倒器、 扶茎器, 扶穗器, 果穗导板; [采矿]井口防护栏lightning guard1.避雷针, 避雷器, 雷电?て?lipless guard1.(切割器的)无唇护刃器, 无上舌护刃器, 平顶护刃器magnetic guard1.磁性钢丝面罩main rod guard1.主杆护架metatarsal guard1.脚面罩(防止重物压脚)movable side guards1.推床的活动导板pedal guard1.踏板安全装置pick-up guard1.扶倒器, 扶茎器, 扶穗器pick up guard1.扶倒器, 扶茎器, 扶穗器prevention guard1.防火队, 护林员radiator guard1.散热器罩, 水箱罩radio guard1.【讯】无线电警戒safe(ty) guard1.防护装置2.安全板, 安全罩3.安全吊环4.保险装置saw guard1.锯罩shoulder guard1.防护板, 护肩甲板, 防肩spring guard1.弹簧护板spur guard1.保险销surge guard1.振荡闭锁装置weed guard1.(割草机的)平顶护刃器wheel guard1.车轮挡板, 护轮板2.轮罩3.汽车挡泥板winch guard1.绞车护板window dust guard1.窗口挡尘板