Definition of tread verb from the Oxford Advanced American Dictionary

tread

verb
/trɛd/
 
 
trod
/trɑd/
 
, trodden
/ˈtrɑdn/
 
ortrod, trodortreaded, treaded
1 [intransitive] tread (on/in/over something/someone) (old-fashioned) to put your foot down while you are stepping or walkingCareful you don't tread in that puddle.2 [transitive] tread something (+ adverb/preposition) to crush or press something with your feet synonym trampleThe wine is still made by treading grapes in the traditional way.3 [transitive, intransitive] tread (something) (formal or literary) to walk somewhereFew people had trod this path before.He was treading quietly and cautiously.IDIOMS

fools rush in (where angels fear to tread)

(saying) people with little experience try to do the difficult or dangerous things that more experienced people would not consider doingfools rush infools rush in where angels fear to tread

tread carefully, warily, etc.

to be very careful about what you do or say
The administration will have to tread very carefully in handling this issue.tread carefully, warily, etc.

tread a difficult, dangerous, solitary, etc. path

to choose and follow a particular way of life, way of doing something, etc.
A restaurant has to tread the tricky path between maintaining quality and keeping prices down.tread a difficult, dangerous, solitary, etc. path

tread/walk a tightrope

to be in a difficult situation in which you do not have much freedom of action and need to be extremely careful about what you do
The government is walking a difficult tightrope in wanting to reduce interest rates without pushing up inflation.tread a tightropewalk a tightrope

tread water

1 to keep yourself vertical in deep water by moving your arms and legs2 to make no progress while you are waiting for something to happenI decided to tread water until a better job came along.tread water