Off one's trolley
形容人因年老而思维混乱、神志不清或行为古怪。
用于非正式场合形容人糊涂或衰老。
英文释义
Senile.
例句
Grandpa has been off his trolley lately, forgetting where he put his keys.
典故来源
源自19世纪有轨电车，当电车脱离轨道（trolley）时就会失控。比喻人的思维脱离正常轨道，变得混乱或疯狂。