1.
You use ~ to refer to a fact that is well known, usually because it is remarkable or extreme.
Authors are ~ ignorant about the realities of publishing...
ADV: usu ADV adj, also ADV with v
2.
If you get on or get along ~ with someone, you are very friendly with each other and enjoy meeting and being together. (INFORMAL, OLD-FASHIONED)
I got on ~ with Leary from the first time we met.
ADV: ADV after v