动词 sign up:

1. engage by written agreement

2. join a club, an activity, etc. with the intention to join or participate, "Sign up for yoga classes"

signorn.(意大利语)先生=signior.signn.手势；招牌；符号；迹象；正负号v.签；签名；做手势；做标记sign/ sain/ n.符号；signle crystal alumina单晶氧化铝, 氧化铝单晶sign truncated feature符号截断特征sign transfer function符号传递函数sign of a breakthrough取得突破的迹象signing electronically电子签名Sign language training手语训练sign expectancy theory符号期待论sign picture character符号图像字符Signed directed graphs符号定向图

1. The manager has signed up some new players.
   经理已签约雇用几名新队员。