jump in
Verb
Meaning
To enter something quickly, usually a mode of transport.
I jumped in the car, and we sped off to the meeting.
To join in on an activity quickly.
To interrupt someone while they are speaking.
(US slang) To initiate into an organization, usually a gang, with violence.
Source: en.wiktionary.orgSynonyms
Antonyms
Examples
So I am just sitting and waiting, listening, and if something exciting comes, I just jump in.
To do anything truly worth doing, I must not stand back shivering and thinking of the cold and danger, but jump in with gusto and scramble through as well as I can.
Jump in a hole without looking, and there'll be a snake in it every time.
Only a fool tries to jump in the fire.
The frog does not jump in the daytime without reason.
Why jump in the water before the ship turns over.