• synonyms


[ hahrd-on, -awn ]
/ ˈhɑrdˌɒn, -ˌɔn /

noun, plural hard-ons. Slang: Vulgar.

an erection of the penis.


Motivational Quotes For The Hard Worker In Your LifeRead more in this article about some frequently asked questions and fun facts related to our definitions.

Nearby words

hard-liner, hard-mouthed, hard-nose, hard-nosed, hard-of-hearing, hard-on, hard-pressed, hard-put, hard-rock, hard-sell, hard-set

Origin of hard-on

First recorded in 1890–95 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for hard on

hard on


"penile erection," 1893, from hard + on.

Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with hard on

hard on


Also, hard upon, hard by. In close proximity, as in The police were hard on the heels of the thieves, or It was hard upon three o'clock, or Their house is hard by ours. The variants are used less than hard on. [Second half of 1700s]


be hard on. Deal severely with, cause damage to. For example, He asked the teacher not to be too hard on those who forgot the assignment, or That cat has really been hard on the upholstery. [Second half of 1600s] Also see hard time, def. 2.

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.