Solidify (verb) — تصلب وتماسك: To become hard or solid; to make more certain. Below are 7 words with a similar meaning; the linked ones have full GL Dictionary entries with their meaning in Arabic.
To make or become hard or strong.
To put in a place; also a group of things belonging together.
Strengthen; combine; merge; unify; reinforce; integrate; solidify; stabilize
Binding material; concrete ingredient; adhesive substance; construction material; bonding agent; hardening powder
freezefirm upcrystallise
Clot; thicken; solidify; congeal; gel; set; form clumps; become thick
To set from liquid to solid, or for a loose idea to take a firm shape — congeal names the change into a set form, not congestion (the jam).
A jelly-like substance; to set or come together well.