收紧

Traditional form:

收緊

Pinyin (reading):

shōujǐn

Definitions:

• to tighten up (restrictions etc)

Characters:

• 收 - to collect, to gather, to harvest
• 紧 - tense, tight, taut; firm, secure

Traditional characters:

• 收 - to collect, to gather, to harvest
• 緊 - tense, tight, taut; firm, secure