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Verb: top up
  1. Add or give a top-up
Noun: top-up
Usage: Brit, Cdn
  1. An amount needed to restore something to its former level

Derived forms: tops up, top-ups

Type of: indefinite quantity

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top lift
top line
top of the inning
top of the line
top off
top onion
top out
top quark
top round
top side
top up
topaz
topcoat
top-down
top-drawer
topdress
tope
topee
Topeka
toper
toper's nose