atestar bedeutet auf Englisch

cram [crammed, cramming, crams]▼(to press, force, or drive, particularly in filling, or in thrusting one thing into another)
verb
[UK: kræm] [US: ˈkræm]

swarm [swarmed, swarming, swarms]▼(to fill a place as a swarm)
verb
[UK: swɔːm] [US: ˈswɔːrm]The cellar is swarming with mice. = El sótano está atestado de ratones.