verb. strain excessively.
noun. too much strain.
Example sentences of the word overstrain
1. Verb, base form
Do not use the weight someone else has left on the machine, because you could overstrain and hurt yourself.
2. Verb, non-3rd person singular present
You may feel a pinch in your neck if you try to look up at a mirror for too long or overstrain through your upper trapezius (the muscle around your neck).
3. Noun, singular or mass
Following them may help you lessen your current pain, as well as to avoid future overstrain.