プログレッシブ和英中辞典(第4版)の解説
とめおき【留め置き】
原級留め置きになる
be kept [held back] in the same grade
酔っ払いは警察に留め置きになった
The drunk was detained [taken into custody] by the police.
留め置き電報
a telegram to be 「held for [picked up by] the addressee
留め置き郵便
mail to be called for；《米》 general delivery；《英》 poste restante [pòust rest&scripta_acute;ːnt|réstɑːnt]