Broaden/expand/widen sb's horizons Verb + object/complement
To boost one's knowlege and experience
Reading books can broaden our horizons.
My dad encouraged me to participate in outside activities so that I can expand our horizons and widen my social circle.
A part-time job will widen your horizons.
To enhance one's performance, or the quality of one's work in order to do as well as others
The verb "broaden/expand/widen" should be conjugated according to its tense.
Children or adults often say this phrase to get their friends to join in something, especially to jump into a swimming pool (pond, lake, etc.)
“Last one in is a rotten egg!” yelled Jane, jumping into the pool.