hit it off (?.)

• accord
• agree
• agree with
• associate with
• be acquainted with
• be friends
• be inseparable
• chime in with
• correspond
• cotton to
• empathize
• fall in with
• fraternize with
• get along
• get along with
• get on with
• harmonize
• harmonize with
• hobnob with
• identify with
• interchange
• know
• reciprocate
• respond to
• sing in chorus
• sympathize
• understand one another