floss

1. N-UNCOUNT You can use floss to refer to fine soft threads of some kind. 细软线→see also dental floss

Craft Resources also sells yarn and embroidery floss. “手工之家”也售卖纱线和绣花丝线。

2. V-T/V-I When you floss, you use a special kind of strong string to clean between your teeth and gums. 用牙线剔牙

Brush your teeth after each meal and floss daily. 餐后要刷牙，而且每天要使用牙线清洁牙缝。

She was flossing her teeth at the time. 当时她正在用牙线剔牙。