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ANALOGY: a "torque converter" is like two fans facing each other, one powered (input) and the other not powered (output).
The "air" from the powered (input) fan forces the unpowered (output) fan to turn/rotate, but not at exactly the same rpm, with the difference in their rpms being called "slip"...the more slippage there is, the greater the torque-ratio.
Basically the same process occurs inside the transmission torque-converter, except transmission FLUID replaces the AIR in the above example.
Thus, slight changes in engine RPM, not accompanied by equal changes in vehicle VELOCITY, means the torque-converter is NOT in lock-up. Think of lock-up as 1:1 gearing, ie: zero torque-converter slippage.
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