貯金を下げる
ちょきんをさげる to withdraw one's savings

貯金を下ろす
ちょきんをおろす to withdraw one's savings

貯金を殖やす
ちょきんをふやす to increase one's savings

貯金局
ちょきんきょく (Japan's) Postal Savings Bureau

貯金箱
ちょきんばこ savings box bank

貯金通帳
ちょきんつうちょう bank book