tighten

become tight or tighter; "The rope tightened"

• constrict, constringe, narrow — become tight or as if tight
• tauten, firm — become taut or tauter
• compress, constrict, squeeze, compact, contract, press — squeeze or press together
• strain, tense — stretch or force to the limit

• change — undergo a change; become different in essence; losing one's or its original nature