No definitions found for 'upon trust'
Perhaps one of these:
upending,
up in the air,
upon the whole,
upon the spot,
up-and-up,
up-wind,
upon the gad,
up-and-down,
upended,
upwind,
upham, nd,
uppent,
upbind,
up and down,
upon the square with,
upon the tapis,
upend,
upbound,
uphand,
uponthe road,
upon the whole matter,
upon the strength of,
upon the square,
up-and-coming,
upon the matter