のりしろ

糊代
overlap width
margin to paste up

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のりしろ【糊代】

the flap 《of an envelope》; a margin for glu(e)ing [pasting, sticking down]; a tab for glu(e)ing [pasting, sticking down].

●両サイドにのりしろをとる leave a (big enough) margin on both sides for glu(e)ing.