birdlime (n.)youdaoicibaDictYouDict[birdlime 词源字典]
viscous sticky stuff prepared from holly bark and used to catch small birds, mid-15c., from bird (n.1) + lime (n.1). Used as rhyming slang for time (especially time in prison) by 1857.[birdlime etymology, birdlime origin, 英语词源]