on one's mettle
give it one's best shot
damnedest
do one's damnedest
do one's darnedest
strain every nerve
level best
do one's utmost
do one's best
effort
go to the trouble
go for it
front up
try as one may
bear down
hustle
move mountains
dig deep
hit a home run
make do and mend
fight
struggle
try
break a sweat
at pains
darnedest
gird up one's loins
best
try for
bid
make the best of a bad bargain
go for
ministrant
go hard
trick
throw spaghetti at the wall
go to the wall
ply
chalk up
take pains
attending
be at pains
give one's all
go to extraordinary lengths
lay to
indurate
bust one's hump
harden
have a go
give it a try
gain
win
acquire
bootstrap
method of choice
bestowal
bust a gut
helpable
marathonic
subtlety
give it some welly
as best one can
application
show willing
diligence
dead set
make hard work of
put a shift in
effortfulness
push
give something a try
with difficulty
make the best of a bad job
behovefully
strivingly
bring it
buck
endeavorer
laboring oar
operations research
top oneself
exert
sweat
slave
beaver
strife
graft
put the pedal to the metal
endeavor
put one's shoulder into
balls to the wall
go to the ends of the earth
purchase
strive
make a play
bag of tricks
ettle
auxiliarly
self-possessedly