noun
mascara
mas-KAIR-uh/mæˈskærə/
A cosmetic used to make eyelashes darker or fuller.
She brushes mascara onto her lashes to make them darker.

Etymology
Spanish máscara meant “a stain” or “a mask.” The cosmetic was originally used by actors to color hair; its modern sense narrows that coloring function to the eyelashes.
In context
all you do is comb through your eyelashes like so and just keep doing it you want to try and get it perfect so don't aim to put tons of mascara on
More examples
- A second coat of mascara makes her lashes look fuller.
- I wear waterproof mascara when I go swimming.
- He gently removes his mascara before bed.