tap in

Short definition from Wiktionary

Noun

1. 1
   A simple, short putt very close to the hole.
2. 2
   A simple shot into the goal from close range, and without opposition.
3. 3
   Alternative form of tap in.

Verb

1. 1
   To kick a simple shot, without opposition, from close range into the goal.
2. 2
   To enter a public transport system (especially the London Underground) by tapping a travelcard on the card-reader
3. 3
   To contact (someone); to call (someone) on the phone.
4. 4
   To switch places with someone.