1. blow someone off: 不搭理、拒绝、让某人一直等着
" She's going to blow off John because she's not interested in him. =不搭理
" The party was full of losers so she blew it off. =cancel
2. check out someone：打量
Why don't we go and check out those cute girls?
3. come on to ：吸引某人、跟某人调情=flirt
She felt bold and confident enough to come on to him at the party.
4. fix someone up to ：安排约会
I thought you didn't like her and had fixed her up with your friend Paul.
5. hit it off：相处很融洽
I took her to dinner and we totally hit it off.
6. let someone down easy： 不伤害别人
" No bloody way = Letting them down hard
" Sorry I won't be in town = Let down easy
" The teacher knew that Paul would have to repeat the course and that there was no way to let him down easy.
7. on the rebound: 恋爱空档期
Jeremy just broke up with his girlfriend, it looks like Jane is trying to catch him on the rebound!
8. play hard to get：故意摆架子(表明说不其实内心一阵狂喜)
I cannot tell whether she doesn't like me or if she is playing hard to get.
9. strike out to ： 失败
Every time Benny asks a girl, he strikes out. Maybe he is too aggressive.