on tap
成語所屬單字tap
on tap — 慣用語
1. 1) served directly from a barrel through a tap (of beer or cider); 2) available
1.慣用語
釋義
1)（啤酒）桶裝現榨的；2)隨時可用的；唾手可得的
1) served directly from a barrel through a tap (of beer or cider); 2) available for immediate use whenever needed (figurative, of information, services, expertise)
例句
This pub keeps three different stouts on tap all year round.
A good personal assistant keeps all your appointments and contacts on tap.