"ir disminuyendo" in English

to tail away- to whittle away

to belong- to come along- to cruise- to fit in- to get around- to go along- to go along- to go around- to go down- to go down- to go on- to go over- to go up- to go up- to live- to ride- to run- to travel- to go

Ir

decreasing

to wane- to work down- to abate- to cut down- to decline- to de-escalate- to drop away- to drop off- to dwindle- to ease- to ease- to ease off- to ebb- to flag- to go down- to let up- to scale down- to shrink- to slacken off- to slacken off- to slacken off- to subside- to tail off- to taper off- to thin- to thin out- to decrease- to diminish- to fall- to lower- to reduce- to cut back on- to lessen- to slacken- to bring down- to cut- to drop- to fall off