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top quark
(physics) A quark having a fractional electric charge of +2/3 and a mass of about 178,000 MeV. / Symbol: t
top priority
(uncountable) Relatively highest importance. / (countable) Item of highest importance.
top it off
(idiomatic) To emphasize or underscore; to make something even better or worse.
（ present singular third-person ）
（ participle present ）
（ participle past ）
（ past ）
top-up
top-up
An addition. / A serving of drink used to top up an existing glass. / (insurance) An additional premium paid over the initial premium in order to increase benefit values.
top-heavy
having a high centre of gravity, and liable to topple / (of an organization) having an excessive number of administrators or managers
top-down
Of or relating to a hierarchical system that progresses from a single, large basic unit to multiple, smaller subunits. / Produced, controlled, or directed by those at the top of the hierarchy.
top deck
The upper deck of a double-decker bus.
top hat
A man's formal hat, with a tall cylindrical crown (often of silk). / (construction) A kind of steel batten.
