adding and subtracting

adjustment / make an allowance for / make allowance for / adjust / moderation / in moderation / control / regulate / moderate / allowance

tie-up / sluggish / accumulation / be delayed / be behind with one's work / be behind in one's work / be belated / the congestion of traffic / stagnation / be tied-up / accumulate / falling into arrears / stagnate / pile up / <<bills>> pile up (and be left unpaid) / delay / fall into arrears

tie-up / be tied up / bottleneck / stagnation / piling up / accumulate / stagnating / stagnate / pile up / be bottlenecked / congestion / pile-up / accumulation / being tied up / accumulating

make a mistake / failure / mistake

throw *something in / drop *something in

throw *something in / drop *something in

suit / fit / apply

fit / adjust

set up / establish