to put on in an existing state or condition; keep in presence or continuance; protect from lapse, drop, failure, or cessation; keep up: as, to maintain an upright mindset; to maintain a conversation.
To provide means for the subsistence or existence of; sustain or help with the way of livelihood; offer; support: since, to steadfastly keep up a family or an army; to steadfastly keep up a pricey equipage.
to put on fast; keep in possession; preserve from capture or loss: as, to steadfastly keep up a person's floor in battle or in debate; to maintain a plus.
To give assistance or reassurance to; uphold; countenance; vindicate, as by protection or adjudication.
To support by argument or assertion; hold to: because, to steadfastly keep up the doctrine of this Trinity.