assume · verb T /əˈsuːm/Full view
B2 to think that something is true, without question or proof
Dictionary examples:

I assumed (that) you knew each other because you went to the same school.

I invited her just assuming she would want to come.

Learner example:

The police assumed he was lying so they put him [in] jail. (First Certificate in English; B2; Chinese)

assume control/power/responsibility, etc.
C2 to take a position of control/power/responsibility, etc.
Dictionary example:

He has assumed the role of spokesman for the group.

Learner example:

She got involved in the marketing business there and assumed responsibility very soon - she became the marketing director for continental Europe. (Certificate of Proficiency in English; C2; German)

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