In the context of an aircraft, taxied means the following:

1 aof an aircraft : to go at low speed along the surface of the ground or water b: to operate an aircraft on the ground under its own power.

It means the aircraft has pulled away from the boarding gate and is taxiing on the tarmac to its departure runway

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Note added at 5 hrs (2008-02-01 01:08:48 GMT)
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"Taxied" is the past tense of "to taxi" which is what a plane is doing as it rolls slowly down the runway. So, when the aircraft leaves the gate (where you board the plane at the airport) is is taxiing down the runway to get into position for takeoff.

It would be great if you could provide more details.

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Note added at 6 hrs (2008-02-01 01:35:52 GMT)
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Please check if धीरे-धीरे चला is more appropriate in your text.