keep sth to oneself 保密 ; 不让他人分享 ; 但请为我们保密 ; 不与他人分享

to keep sth secret 秘而不宣

to keep sth confidential 保密

keep sth down to size 把某物限制在一定规模内

keep sth to yourself 把…秘而不宣 ; 保守秘密

to keep sth quiet 不提

to keep quiet about sth 不提