build · verb I or T /bɪld/Full view
Nouns: build, builder, building
Verbs: build, rebuild
A2 to make something by putting materials and parts together
Dictionary examples:

They're building new houses by the river.

These old houses are built of stone.

Contractors have started building on waste land near the town.

Learner example:

It was built in 1880. (Key English Test; A2; Chinese)

build (sth) up or build up (sth)
C1 to increase or develop, or to make something increase or develop
Dictionary examples:

This will help to build up his confidence.

She exercises daily to build up her strength

Learner example:

What might take a long time to build up could be ruined in a very short time. (Certificate in Advanced English; C1; Swedish)

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