noun
A cylindrical tool used to flatten and shape dough. The kanji 伸ばし棒 literally means 'stretching stick'.
See also: 麺棒
パイ生地を伸ばし棒で薄く伸ばす。
Roll out the pie dough thinly with a rolling pin.
狭い場所のボルトを回すには、伸ばし棒を使うと便利だ。
Using an extension bar is handy for turning bolts in tight spaces.
noun
long vowel mark; prolonged sound mark
Colloquial term for the long vowel mark (ー) used in katakana and sometimes hiragana. The formal term is 長音符 (ちょうおんぷ).
See also: 長音符
カタカナの「コーヒー」には伸ばし棒が二つある。
In the katakana word コーヒー, there are two long vowel marks.
Compound of 伸ばし (noun form of 伸ばす 'to stretch/extend') + 棒 'stick/bar'. The spelling 延ばし棒 uses a kanji with a similar meaning. The colloquial sense for the long vowel mark comes from the visual resemblance to a bar that stretches the sound.