1. muscles tightening with fatigue �����۶���÷����ļ���
2. I have to tighten my belt this month. �������Ҫ�ս��������������ˡ�
3. She suddenly felt her heart tighten, and began to cry, there were tears of joy and of satisfaction. ����Ȼ������ͷһ������֪��ô�ľͿ������������ǿ��ֵ���ˮ���������ˮ��
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v.
1. make tight or tighter
2. become tight or tighter
3. restrict
4. narrow or limit