Meaning of “top” - Learner’s Dictionary

top

noun uk us /tɒp/
HIGHEST PART [ C ]

A2 the highest part of something:

They were waiting for him at the top of the stairs.
I want a cake with cherries on top.
SURFACE [ C ]

the flat, upper surface of something:

the table top
LID [ C ]

the lid or cover of a container, pen, etc:

Put the top back on the bottle.
CLOTHING [ C ]

B1 a piece of women's clothing worn on the upper part of the body

TOY [ C ]

a toy that turns round and round when you move its handle up and down

the top

the most important position in a company, team, etc:

At forty he was already at the top of his profession.
at the top of your voice UK (US at the top of your lungs)

shouting very loudly

(Definition of “top noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)