if you do something day in, day out, you do it every day over a long period, often causing it to become boring.

Life can become very tedious if you do the same work day in, day out.

Dave wore the same tie day in and day out.

• at any rate
• at a pinch
• at a premium
• at a price
• at a push
• at a rate of knots
• at a snail's pace
• at a stretch
• at a time
• at beck and call
• at best
• at convenience
• at cross purposes
• at cross-purposes
• at death's door
• at each other's throats
• at earliest convenience
• at ease
• at elbow
• a tell-tale
• a tempest in a teapot
• at every turn
• at expense
• at fingertips
• at first blush