借势

借势	jiè shì	to borrow sb's authority / to seize an opportunity
借	jiè	to borrow / (used in combination with 给 or 出 etc) to lend / to make use of; to avail oneself of / (sometimes followed by 着) by; with
借	jiè	variant of 借
势	shì	power / influence / potential / momentum / tendency / trend / situation / conditions / outward appearance / sign / gesture / male genitals