a person who secretly collects and reports information on the activities, movements, and plans of an enemy or competitor 间谍 ■a person who keeps watch on others secretly 密探,暗探 [as modifier]a spy camera. 间谍照相机。
(-ies, -ied)
[no obj.]work for a government or other organization by secretly collecting information about enemies or competitors 当间谍,从事间谍活动 he agreed to spy for the West. 他同意作西方国家的间谍。 ■(spy on)observe (someone) furtively 暗中监视,暗中观察 the couple were spied on by reporters. 这对夫妇受到记者盯梢。 ■[with obj.]discern or make out, especially by careful observation 认出;看出 he could spy a figure in the distance. 他能看清远处的人影。 ■[with obj.](spy something out)collect information about something to use in deciding how to act 侦察出;探明,查明 he would go and spy out the land. 他将去探明地形。
语源
Middle English: shortening of Old French espie 'espying', espier 'espy', of Germanic origin, from an Indo-European root shared by Latin specere 'behold, look'