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We report a time-lapse eclipse mapping analysis of B-band time-series of thenova-like variable UU Aqr along a typical stunted outburst in 2002 August. Discasymmetries rotating in the prograde sense in the eclipse maps are interpretedas a precessing elliptical disc with enhanced emission at periastron. From thedisc expansion velocity a disc viscosity alpha_{hot}= 0.2 is inferred. Theoutburst starts with a 10-fold increase in uneclipsed light, probably arisingin an enhanced disc wind; the disc response is delayed by 2 d. The results areinconsistent with the disc instability model and suggest that the stuntedoutburst of UU Aqr are the response of its viscous accretion disc to enhancedmass-transfer events.

The stunted outbursts of UU Aquarii are likely mass-transfer events