tap

1 tap /ˈtæp/ verb
taps; tapped; tapping
1 tap
/ˈtæp/
verb
taps; tapped; tapping
Britannica Dictionary definition of TAP
1 
: to hit (someone or something) lightly especially with a small sound
[+ object]
[no object]
2 
: to hit (your fingers, feet, etc.) against something lightly
[+ object]
[no object]
3 
[+ object] chiefly US : to choose (someone) for a particular job, honor, etc. — often + for — often followed by to + verb

tap in/into

[phrasal verb]
tap (something) in or tap in (something) or tap (something) in/into (something)
: to put (information) into a machine (such as a computer or telephone) by pushing buttons

tap out

[phrasal verb]
1 
tap (something) out or tap out (something)
: to follow the pattern of (something, such as a rhythm) by tapping on a surface
2 
: to press buttons on a computer or typewriter to write (something)
2 tap /ˈtæp/ noun
plural taps
2 tap
/ˈtæp/
noun
plural taps
Britannica Dictionary definition of TAP
[count]
1 
: a light hit or touch or the sound that it makes
2 
: a small metal plate on the sole or heel of a shoe used for tap dancing
3 tap /ˈtæp/ noun
plural taps
3 tap
/ˈtæp/
noun
plural taps
Britannica Dictionary definition of TAP
[count]
1 
: a device for controlling the flow of a liquid or gas from a pipe or container: such as
a  : faucet
◊ In British English, tap is the usual word for this device. In U.S. English, tap is also commonly used in this way, but faucet is more common.
— see pictures at bathroom, kitchen; see also tap water
2 
: a device that allows someone to secretly listen to phone conversations
— called also wiretap

on tap

2 
: available whenever you need it
3 
US : planned or scheduled to happen
4 tap /ˈtæp/ verb
taps; tapped; tapping
4 tap
/ˈtæp/
verb
taps; tapped; tapping
Britannica Dictionary definition of TAP
1 
: to take or use money, knowledge, etc., from a source
[+ object]
[no object]
— often used figuratively
2 
[+ object] : to make liquid flow from something by attaching a special device (called a spigot or tap), making or opening a hole, etc.
3 
[+ object] : to place a device on (someone's phone) in order to secretly listen to telephone calls
4 
[+ object] : to get something useful or valuable from (someone) — usually + for