go steady with someone—(coll.) have a person as a regular boyfriend or girlfriend:
- I thought we were to be married: he’d gone steady with me six months…
Note: The expression does not correlate in meaning with the adjectival compound steady-going—used of a staid and sober person:
- Today that boy is a steady-going, industrious, and fairly efficient electrician’s helper.
go steady with something —(coll.) be careful or thrifty in the use of smth.:
- Here, you two, just go steady with that bottle! I want a couple of grams left for Dad and Harry.