under its own steam

:  in or into a position below or beneath something

:  below or short of some quantity, level, or limit

:  in or into a condition of subjection, subordination, or unconsciousness

:  below or beneath so as to be overhung, surmounted, covered, protected, or concealed by

:  subject to the authority, control, guidance, or instruction of

:  receiving or undergoing the action or effect of

:  lower in rank or authority :  subordinate

: used to express immediate or direct kinship

:  to have or hold as property :  possess

:  to have power or mastery over

:  to acknowledge to be true, valid, or as claimed :  admit

:  a vapor arising from a heated substance

:  the invisible vapor into which water is converted when heated to the boiling point

:  the mist formed by the condensation on cooling of water vapor

:  to give out as fumes :  exhale

:  to apply steam to

:  to expose to the action of steam (as for softening or cooking)