single-space

verb
sin·​gle-space | \ ˈsiŋ-gəl-ˈspās How to pronounce single-space (audio) \
single-spaced; single-spacing; single-spaces

Definition of single-space

transitive verb

: to type or print with no blank lines between lines of text

First Known Use of single-space

1928, in the meaning defined above

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