1. Describing Trends in Graphs

2. an upward trend (a rising trend)

3. GO UP -
GROW GROWTH
RISE RISE
INCREASE  INCREASE
IMPROVE IMPROVEMENT
- UPTURN
SOAR  -
JUMP  JUMP
(SKY)ROCKET -
SURGE SURGE 
- UPSURGE
TAKE OFF TAKEOFF
SHOOT UP -
LEAP LEAP
PEAK/REACH A PEAK PEAK
TOP OUT -

4. to soar

5. to surge

6. to shoot up

7. a downward trend (a falling trend)

8. DECREASE DECREASE
GO DOWN -
DECLINE  DECLINE
DROP DROP 
FALL (OFF) FALL
SLIP SLIP
- DOWNTURN
SLIDE SLIDE
DIP DIP
PLUNGE  PLUNGE
PLUMMET  PLUMMET
NOSEDIVE  NOSEDIVE
SLUMP SLUMP
CRASH CRASH
SINK -
TUMBLE TUMBLE

9. ECONOMICS IS FLYING (AIR)
PLUMMET
TURBULENCE
NOSEDIVE
FREE-FALL
SPIRAL
LANDING
GO THROUGH THE ROOF
“When interest rates went through the roof, so did Mr Macdonald!”

10. ECONOMICS IS DIVING (WATER)
PLUNGE
FLOAT
DIP
DIVE
SINK

11. ECONOMICS IS MOVING ON THE GROUND
TUMBLE
JUMP
TOPPLE
SLIDE
SLIP
WOBBLE
STAGGER
STUMBLE

12. to bottom out to recover to rebound to revive
Change of direction
to bottom out
to recover
to rebound
to revive

13. to rebound
'Stocks rebounded from yesterday's losses on news that 'it aint over till it's over'.'

14. NO CHANGE
to remain stable
to level off/out
to stay at the same level
to remain constant
to stagnate
to stabilize

15. NO CHANGE to remain constant / to remain stable

16. Trends & movements - verbs

17. Indicating the degree of change

18. Indicating the speed of change