v.把…对折，折叠( double的过去式和过去分词 ); 是…的两倍; （使）加倍; 兼任

frequency-doubled → 倍频的
doubled yarn → 合股纱线；合伙纱线
with might doubled → 如虎添翼
cop-and-cop doubled yarn → 混合双股线
doubled haploid → 双单倍体；重双单倍体
doubled words → 重复的单词；双字
be doubled up → 笑弯了腰
has doubled → 增加了一倍；已增加了一倍
frequency-doubled effect → 倍频效应

【Adjective】

1. twice as great or many;
"ate a double portion"
"the dose is doubled"
"a twofold increase"
2. folded in two;
"doubled sheets of paper"