the lookout

to watch for something

a setback

encounter a problem

backlash

negative reaction

a slip-up

a mistake

offshoot

a new development in a new direction

a comeback

returning to to the limelight

showdown

a confrontation

upturn

an improvement

a drawback

a disadvantage

hold-up

an armed robbery/ delay

outburst

sudden expression of emotion

knock-out

overwhelm or amaze/ defeat a competitor / hit so hard as to become unconcious

pickup

raise or lift / collect / improve