strengthen up
Upper Intermediate (B2) informal
To get stronger or to make something stronger.
"You need to strengthen up your core muscles to prevent back injuries."
Hear it in context
5 Simple Core Exercises For Rock Hard Erections (& No Urine Dribble)
Eric Leckie DPT · 0:03
Now, if you are looking to strengthen up
Rock Hard Erections & No Dribble in 10 Minutes (Kegels Workout)
Eric Leckie DPT · 11:59
Today was a very entrylevel workout to strengthen up your pelvic floor muscles,
5 Simple Core Exercises For Rock Hard Erections (& No Urine Dribble)
Eric Leckie DPT · 0:24
So, if you are ready to strengthen up the rigidity of your erections and to stop