Every Saturday I’ll give you a couple of idioms to learn. An idiom is a saying or phrase whose meaning cannot be taken from the literal meanings of the words.
wildcat strike: a strike spontaneously arranged by a group of workers
Example:
The garbage men’s union went on a wildcat strike, and the trash has been piling up all week.
wolf in sheep’s clothing: a person who pretends to be good but really is bad
Example:
Lester may seem like a nice guy at first, but I’m telling you – he’s a wolf in sheep’s clothing.